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Repetition Suppression: Two Perspectives Analysis

This study explores repetition suppression from two perspectives by analyzing sentences with same or different speakers. The effects of repetition, speakers, and sentences are reported through a categorical and factorial analysis, aiming to understand interactions and contrasts. Findings suggest an exponential decay for same sentences, showing consistent effects across contrasts. The conjunction analysis further highlights the impact of sentence effects. Detailed parameter estimates for sentences 1 to 6 are provided, offering insights into the factors influencing repetition suppression.

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Repetition Suppression: Two Perspectives Analysis

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  1. Repetition Suppression – Two perspectives 2 Way Analysis 3 Way Analysis Sentences Same Different Sentences Same Different 1 2 3 4 5 6 Repetition Speakers Same Different Speakers Same Different Contrast testing for Repetition Suppression • Interactions of Repetition Factor • with Speaker Effect • with Sentence Effect • Categorical Comparisons • Speakers: Different > Same • Sentences: Different > Same

  2. General Linear Model • 3 factorial design • Sentence: Different, Same • Speaker: Different, Same • Repetition: 1,2,….6 Effects are reported at p<0.05 corr.

  3. Categorical Analysis Speaker Effect: Different > Same no effects at p<0.05 corr. Sentence Effect: Different > Same R L Similar results when limited to the last 5 sentences:

  4. Categorical Analysis: Sentence Effect 48 15 12 -51 9 24 42 36 -12 R. inf. precentral sulc. L. inf. precentral sulcus R. inf. frontal g. R L 63 -6 -28 -69 -45 0 -72 -27 0 R. ant. middle temp. g. L. post. middle temp. g. L. sup. temp. g. Same Different Parameter estimates for sentences 1…6 relative to baseline for Different and Same sentences averaged over speaker effect

  5. Factorial Analysis Repetition suppression: Exponential decrease increased for same vs. different? Repetition X Speaker Effect no effects at p<0.05 corr. Repetition X Sentence Effect no effects at p<0.05 corr.

  6. Combining the two perspectives: Conjunction analysis 1. Sentence effect: Different > Same 2. Exponential Decay for Same>Different sentences => Consistent effects across the two contrasts L. ant. sup. temp. g. R. inf. precentral sulc. L R L R L -66 -3 -8 51 15 12 Same Different Parameter estimates for sentences 1…6 relative to baseline for Different and Same sentences averaged over speaker effect

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